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Fri, 22 Sep 2023 06:56:33 +0000 From: Elena Ufimtseva To: quintela@redhat.com, peterx@redhat.com, leobras@redhat.com Cc: elena.ufimtseva@oracle.com, qemu-devel@nongnu.org Subject: [PATCH 1/4] multifd: wait for channels_ready before sending sync Date: Thu, 21 Sep 2023 23:56:22 -0700 Message-Id: <20230922065625.21848-2-elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230922065625.21848-1-elena.ufimtseva@oracle.com> References: <20230922065625.21848-1-elena.ufimtseva@oracle.com> X-ClientProxiedBy: SJ0PR03CA0140.namprd03.prod.outlook.com (2603:10b6:a03:33c::25) To BYAPR10MB2869.namprd10.prod.outlook.com (2603:10b6:a03:85::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB2869:EE_|IA1PR10MB7419:EE_ X-MS-Office365-Filtering-Correlation-Id: d8d74098-275d-4750-f589-08dbbb390e42 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=elena.ufimtseva@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org In multifd_send_sync_main we need to wait for channels_ready before submitting sync packet as the threads may still be sending their previous pages. There is also no need to check for channels_ready in the loop before the wait for sem_sync, next iteration of sending pages or another sync will start with waiting for channels_ready semaphore. Changes to commit 90b3cec351996dd8ef4eb847ad38607812c5e7f5 ("multifd: Fix the number of channels ready") Signed-off-by: Elena Ufimtseva --- migration/multifd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/migration/multifd.c b/migration/multifd.c index 0f6b203877..e61e458151 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -595,6 +595,7 @@ int multifd_send_sync_main(QEMUFile *f) } } + qemu_sem_wait(&multifd_send_state->channels_ready); /* * When using zero-copy, it's necessary to flush the pages before any of * the pages can be sent again, so we'll make sure the new version of the @@ -630,7 +631,6 @@ int multifd_send_sync_main(QEMUFile *f) for (i = 0; i < migrate_multifd_channels(); i++) { MultiFDSendParams *p = &multifd_send_state->params[i]; - qemu_sem_wait(&multifd_send_state->channels_ready); trace_multifd_send_sync_main_wait(p->id); qemu_sem_wait(&p->sem_sync);